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2018-19 Mustang Roush Performance Pac - Level 2 GT by Roush

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  • 422114 2018-2019 MUSTANG GT RO
  • 422114 2018-2019 MUSTANG GT RO
  • 422114 2018-2019 MUSTANG GT RO
  • 422114 2018-2019 MUSTANG GT RO
422114 2018-2019 MUSTANG GT RO
  • 422114 2018-2019 MUSTANG GT RO
  • 422114 2018-2019 MUSTANG GT RO
  • 422114 2018-2019 MUSTANG GT RO
  • 422114 2018-2019 MUSTANG GT RO

Bolt-on instant horsepower and torque with this 2018-2019 Mustang GT Stage 2 Performance Pac w/ with PCM flash and axle back exhaust from Roush!

Item #RSH-422114
MPN# 422114

Everyday Low Price: $1,399.99

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  • Adds 24 RWHP & 18 FT-LBs Torque Over Stock
  • Menacing Exhaust Tone
  • Improved Throttle Response
  • 3 Year/36,000 Mile Warranty
  • 50 State Legal


  • Cold Air Intake
  • 91 Octane Roush Calibration
  • 3.5" Chrome Quad Tips
  • T-304 Stainless Steel

What's in the Box

  • (1) Roush Cold Air Intake
  • (1) PCM Flash Voucher
  • (1) Roush Axle Back
This part is 50-state legal - CARB E.O. #: D-418-32

Roush Brand Image

Product Description

Mustang GT Roush Performance Pac Level 2
Upgrade the performance in your 2018-2019 Mustang GT with this Level 2 Performance Pac from Roush! Roush includes a cold air intake, axle back exhaust and flash voucher specifically engineered for your 2018-2019 Mustang GT. These parts work together to unleash hidden power in your Coyote engine. Your Mustang's stock air intake is restrictive and is holding you back from increasing the power. This ROUSH cold air kit is fully tested and calibration certified to work seamlessly with the performance ECU reflash. Adding this kit not only improves horsepower and torque throughout the entire power band but gives you better throttle response as well! With this Roush Level 2 Performance Pac you will be looking at increases of over 24 RWHP and 18 lb-ft RWTQ, by simply bolting it on and uploading the tune!

Roush Axle Back Exhaust Kit
Roush includes their signature axle back exhaust kit with this Level 2 Performance Pac to provide a menacing sound to your S550. Roush's axle back kit features top of the line dual high flow mufflers that opens up your exhaust system and doesn't reroute gasses that cause back pressure. This gives you a raspy loud sound, unlike a restrictive factory muffler.

Roush Calibration
Roush calibration engineers have extensive OEM calibration experience to ensure strong performance without sacrificing driveability. Their calibrations are developed with hundreds of hours spent in the lab and on the dyno, testing, and validating their calibrations, setting this Performance Pac apart from needing any guesswork tuning! Included in this Performance Pac is the Voucher, which allows for the ability to “flash” the vehicle's PCM, but this will require a J2534 tool, this can easily be done at your local Ford dealer. Please note service charges may apply.

Roush Quality
Roush Performance builds all of their parts to OEM standard for the best fit, finish, and performance. This S550 cold air intake and exhaust kit are no exception. Using computer-aided design (CAD), this Roush cold air intake kit is designed as a direct fit installation and is optimized for a complete hood seal with no cold air loss. A dry filter is utilized to retain its shape under high airflow. Wire mesh inner and outer layers provide durability, and the highest filtration possible. No oiling is required, and is easily washable for re-use! The included exhaust kit uses T-304 stainless steel pipes with 3.5" stainless steel quad polished tips that fight corrosion and rust to give you long-lasting performance!

Requires J2534 Interface tool, just about any dealer can perform the calibration using your 2018-2019 Mustang's ECU using Roush's RDT software. Dealer service charge may apply.

This Performance Pac is NOT designed to be compatible with other aftermarket powertrain components!

-Fits 2018-2019 Mustang GT

ROUSH® Limited Warranty - Click Here

California Residents:
WARNING: Cancer and Reproductive Harm- www.P65Warnings.ca.gov

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Vehicle Applications

Ford Mustang - 2018 (18) - 2019 (19)

About This Brand

Roush - The Art of Performance Engineering
ROUSH Performance is the first specialty-vehicle company to combine race-proven technologies with advanced automotive engineering. The result, a unique mix of street car and race car...Is a ROUSH car. Or more specifically, a ROUSH Mustang or F-150 pickup with styling, performance, and handling characteristics derived from the racetrack and modified for street legal usage. The vehicles and components produced by ROUSH Performance are imprinted with Jack Roush's vision, passion for performance, and commitment to excellence. He personally approves the design, engineering, fit, finish and overall performance of each package, ensuring that his personal standards are met prior to production and product release. Many of these products are designed by the same engineering group that has helped Roush Racing become the winningest Ford racing team in history.

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